How to play in these server?

[MeckRand10000]

Whenever I try to play says: Connection lost end of stream
This only happens on the server of this site, so I would like to know what happens, maybe it's the launcher, or my pc, or maybe I need premium account, or buy the original minecraft, or perhaps some other reason.
If someone does the same thing happened to me, or know how to fix the problem please tell me.
Thanks in advance.

 

[Dave | Rev]

Well 1st you need a minecraft premium account. Buy this ONLY from minecraft.net

 

[Sir Royal]

Lol, a pirate.

how cute.